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参数资料
| 型号： | L6246 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | VOICE COIL MOTOR CONTROLLER, 3 A, PQFP44 |
| 封装： | 10 X 10 MM, PLASTIC, QFP-44 |
| 文件页数： | 12/12页 |
| 文件大小： | 162K |
| 代理商： | L6246 |
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If Now We Define:
#3
Aloop
= ACPW
ACERR ACSENSE
RS
RS
+ ZL
we obtain:
#4
IL
VIN
=
Aloop
ACINP
ACSENSE
1
RS
1
+ Aloop
Atlowfrequencyis:
Aloop
= 32
R2
R1
10
RS
(RS + ZL)
if R2 = 1M, R1 = 1K, RS = 0.2, RL = 7
then Aloop = 8889 = 80dB.
Being Aloop very high we can simplify the #4 in
this way:
IL
VIN
=
ACINP
ACSENSE
1
RS
=
1
10
0.2
=
1
2
For the stability we have to study the stability of
Aloop, that as we can see from the #3 is a multi-
plication, so in dB is a sum:
Aloop | dB = ACPW | dB+ACERR | dB+ACSENSE |
dB +
RS
RS
+ ZL
dB
So we can take in consideration the BODE dia-
grams of the each operational amplifier, with par-
ticular attention to the Error amplifier.
1)The Power amplifier is actually composed by
two operational amplifiers in the way to have
a gain of +16 and -16 (in voltage) respec-
tevely, for a total of 32 = 30dB.
The point at -3dB is around 130KHz.
2)The Sense amplifier has a gain of 20dB with
the point at -3dB around 210KHz.
3)The load introduce an attenuation of:
20log
RS
RS
+ RL
= -31dB with RS = 0.2 and RL = 7
and its pole is at frequency
1
2
π L
(RS + RL
)
so around 1KHz if L = 1.2mH.
So considering:
Ax | dB = Aloop | dB ACERR | dB ACPW |
dB+ ACSENSE | dB +
RS
RS
+ RL
dB
we have these Bode diagrams:
As can be easily see the bandwith is narrow and
the gain is low. It is possible to increase both
choosing an appropriate compensation of the Er-
ror amplifier.
The total bandwith should be, of course, at least a
decade lower of the 130KHz to avoid instability
problem. The bandwith guaranteed by the Error
amplifier has a Gmax of 80dB and a gain of 0dB
at 1MHz approximately, the real is some dB more
with a larger bandwith.
ACPW
30dB
130KHz
ACSENSE
20dB
210KHz
-31dB
LOAD
AX
19dB
1K
10K
100K
D95IN270A
L6246
9/12
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